Improvement in pulp-screen cleaners



muommeswomn. PULP-SCREEN CLEANER.

No.175,286. Patented March 28,1876.

Ulvrrnn STA S PATENT OFFICE.

HENRY HOLLINGSWORTH, OF HERKIMER, NEW YORK.

IMPROVEMENT IN PULP-SCREEN CLEANERS.

Specification forming part of Letters Patent No. 175,286, dated March28, 1876; application filed February 17,1876.

To all whom it may concern Be it known that I, HENRY HOLLINGS- WORTH, ofHerkimer, in the county of Herkimer and State of New York, have inventeda new and useful Improvement in Machines for Cleaning Paper or Wood PulpMachine Screens, which improvement is fully set forth in the followingspecification, reference being had to the accompanying drawings, inwhich Figure 1 is a top view of my improved paper-screen cleaner. Fig. 2is a vertical longitudinal section in the line at w of Fig. 1. Fig. 3 isa modification of the invention.

The nature of myinvention consists, first, in a screen-frame whichsupports pulleys, belts, and a brush or brushes, and is hinged to oneside of the pulp-vat, so as to be readily turned out of or into saidvat, whereby convenient access to the interior of said vat is securedforthe removal of the contents thereof.

Myinvention consists, second, in endless belts or chains passing overpulleys and carrying one or more revolving brushes, which are made topass over the screen and very effectually clean the surface thereof atcertain intervals of time.

My invention consists, third, in the special construction of the troughcontaining the screens and removable parts of my improved machine,whereby the matter swept off the screen by the brushes is received in anadjoining compartment containing screens of liner openings.

In the drawings, A represents a large vat, which supports a trough, B,at some distance from the bottom. The trough B is provided withtransverse arms I) b by means of which it rests upon the top part of thevat A, and two of which arms 0 are, by means of a longitudinal rod, 0,and elbow stands 0, fastened to two arms, a, of the vat A, therebyforming a hinge-joint and enabling the operator to turn over the troughB entirely out of the vat A without detaching it therefrom. At thebottom of the said trough screens D are inserted and supported from.below by transverse bars (1. On the rim of the trough B pedestalbearing E E are fastened, those marked E being longitudinallyadjustable. The said pedestalbearings form the support of the shafts F,one of which is provided with a crank, or a pulley. The said shafts areprovided with pulleys G and belts or bands H, upon which thebearing-blocks h of a brush, 1, are so fixed that the brush may be movedwith the said belts and parallel to the shafts F. The body of the brushI is, by preference, of cylindrical form, and provided in the usualmanner with bristles or other suitable material. The guidestrips J, nearthe bottom of the sides of the trough, serve as supports for thetraveling bearing-blocks h and for keeping the brush I at the properdistance from the surface of the screen.

A bracket, K, fastened to the side of the trough B, and between thepulleys G, serves as a support for a rack, L, between the shafts F.

The brush I is provided with a pinion, i, which when the brush passesunder the rack L gears into the said rack and revolves the brush in thedirection indicated by an arrow.

The inner front corner of the trough is rounded off concentrically withthe shaft F by inserting therein a block, M. A shallower block, N, ofsimilar construction is placed in a similar manner across the screenand'concentric to the other shaft F, thereby dividing the space insidethe trough in two unequal chambers, the smaller one 0 of which isgenerally provided with a finer screen, which allows the pulp to gothrough 'free of all dirt. If a finer screen was not provided in thischamber 0, the fine dirt would go through with the pulp.

My invention herein described will be found very useful in wood-pulp aswell as in paper mills for cleaning screens, and I therefore do notlimit my invention to paper-mill screens.

Operation: The operator sets the machine in motion by turning the crankf. The belts are moved in the direction indicated by an arrow, and carrythe brush I along. As soon as the said brush touches the screen, thepinion 5 comes in contact with the rack L, and is revolved in thedirection indicated by an arrow. By the described motion of the pinionand the brush, the screen D is very rapidly and thoroughly cleaned. Thebrush, in rising from the screen in front of its own course, keeps thematter of which the screen has been freed by it up and off the screen,and finally pushes it over the block N into the compartment 0. Therevolutions of the brush cease as soon as itleaves the screen, and thebrush is then merely carried over the pulleys G until it descends intothe trough again, when the above-described operation is repeated.

For cleaning screens of the coarser class, the revolving belts H may beprovided with one or more transverse fixed brushes, I, as seen in Fig.3, and thus the machine made to perform the operation of cleaningwithout having the brushes rotate about their own axes. I however preferthe rotating brush, as a far greater amount of surface-work will beperformed in a given time and space.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- l. The screen-frame, carrying thepulleys,

belts, and brush, hinged to one side of the pulpyat, so as to be turnedout and into the same, substantially as described.

2. The combination of the pulleys G, the belt H, the pinion t, brush I,and rack L, for

I the purpose of cleaning straight surfaces, sub- HES RY HOLLINGSWORTH.

Witnesses:

JAMES POWELL, JAMES A. SUITER, JR.

